The TCU goes into pairing mode every time you start the car. To pair a phone, turn the car on, and then go into the phone and tell it to search for Bluetooth devices. It should find the TCU and then prompt for the four digit security code on the TCU sticker. I think the car gives you about 2 minutes to pair before it returns to normal operating mode.

edit....

Here is a link that has additional pairing instructions.
http://www.xoutpost.com/articles/all...tooth-ulf.html

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input